Paper bag



D. E. SCTT Jam; 13, 1939.

` PAPE BAG INVENTOR Filed Oct. 19, 21936 ATTORNEYS Patented June 13,1939 PATENTIk OFFICE PAPER BAG Douglas E. Scott,

to The Chase Chagrin Falls, Ohio, Bag Company, corporation of Delawareassignor Cleveland, Ohio, a

Application october 19, 1936; serial No. 106,479

1 Claim.

This invention relates to paper bags and to processes of making thesame. More particularly the invention relates to multi-ply bags, thatis, bags formed of a plurality of layers of material 5 such as paper.

Heretofore, it has been customary to close the ends of paper bags bymeans of a paper binder strip folded over the ends and secured in placeby one or more rows of stitching. These bags have l0 provenobjectionable because they'would tear at the sewed seam, andconsiderable leakage occurred along the line of stitching. The passageof moisture to and from the interior of the bag, due to the openingsthus caused, constitute a fur- 5 ther objection to the use of a sewedseam.

i The principal object of the present invention is to overcomey theforegoing objections present in prior bags and to provide a strongsubstantially air tight and liquid-tight seam.

Other objects and advantages of the inven,- tion will be apparent as thedescription is considered in connection with the accompanying drawing,in which:

` Figure i is a side view, partly broken away, of 2;, a bag embodyingthe present inyention;

Figure 2 is a section on the line t-Z of Figure l;

Figure 3 ure l;

n@ Figure d is a section on ure l; and

Figure 5 is a fragmentary sectional view of a filled bag.,

Referring more particularly to the drawing l denotes a bag comprising aplurality of nested paper tubes 2, one or more of the plies or tubes ofwhich may be of specially treated or coated paper, in the presentinstance, three plies or tubes being illustrated, but it will beunderstood that the number oi plies employed will depend somewhat uponthe weight and nature of the material with which the bags are to befilled.

The lower end of the bag Il is closed by pasting the adjacent lower endedges together with a ilexible water proof and air tight cement, such asrubber compound or the like. 'I'hus all three tubes are ilexiblyconnected to each other by Va relatively narrow film of adhesive 3.After the lower end of the bag has been closed in this 50 manner areinforcing fabric strip 4 isapplied thereto. The inner face of thisfabric strip is coated with a layer or Aiilm 5, of ilexible water proofand air tight paste or cement, such as the rubberized adhesive 3, usedto secure the adjacent edges o1' the tubes directly to each other, andthe is a section on the line .li-3 of Figthe line 44 of Figthe bag andthe whole -desirable adhesive 5 `the strip 4.

to apply a'solvent to the nlm sealing operations.

From the foregoing it will be noted that the (Cl. 22B- 62) strip is thenbent `or folded over the lower end of subjected to pressure. If may beapplied to the lower of the outermost fabric tube applied to the innerface of outer marginal edge 2, in addition to that The mouth of the bagI is closed in much the same manner as the lower end except that theformer is partially closed before filling and the filling opening isclosed by an additional reinforcing fabric strip. All but the innermosttube 2 are secured together along their upper inner adjacent edges bynarrow layers of flexible water and air proof paste l sim'lar toadhesive 3, the edges of the innermost tub being left unsealed to permitof the bag being lled through a central illing opening, hereinafterdescribed. A reinforcing fabric strip t, formed with a centrally andlongitudinally disposed slit t, is then folded over the top of the bagand cemented to the outer faces of the outermost tube by adhesive il),hav ing the same properties as adhesive 3. The tubes 2l and thereinforcing strip t are then Vtightly sealed by the application ofpressure The slit 9, forms a centrally disposed filling opening equal fin length to about one half of the Width of the bag, which opening isclosed after filling operations, by means of a relativelyshort-reinforcing fabric strip l l, coated on its inner face with a lmof cement i2, identical with the previously described adhesive 3. Thefabric sealing strip il may have one fold thereof attached to one sideface oi the reinforcing fabric strip li, as shown inv the drawing, orthe strip it maybe shipped separate 'fromthe bag. In the latter case thelayer of adhesive I 2 could either beA applied at the factory or by theuser. Where applied at the factory it would merely be necessary for theuser of paste during lling end of the bag is greatly reinforced by thestrip 8 and flexible layers of paste between the strip and the outerface of the outermost tube and between adjacent edges -of the tubes,thus providing a seam capable of withstanding strains and stressesincidental to filling operations. Also that when the baghas been llecland the fabric 'reinforcing strip l l placed over the llirg slit oropening 9, a further reinforcing effect is attained. The strip l i ismuch shorter than the strip 8, and need only be of a length tocompletely' cover the filling opening andto extend at its endssufficiently far beyond the extremities of the opening to insure a tightseal under all handling conditions.

Having thus described myinvention:

What I claim is:

A multi-ply bag comprising a series of nested tubes having their lowerends secured together by means of an adhesive,`.`a fabric reinforcingand sealing strip folded over said cementedlower edges and cementedthereto and to the outer faces of the outermost tube, and the upper endsof the tubes being connected together by cement, a fabric reinforcingand sealing strip cemented to the outer faces of upperend of theoutermost tube and folded over and cemented to the edges of the tubesand having a filling slit in said folded edge opposite the abuttinginner faces of the inner tube, and a fabric closure strip cemented toone side face of the last-mentioned fabriclreinforcing and sealing stripand having an adhesive on its inner upper face whereby after the bag isfilled the closure strip is drawn over the edges of the reinforcing andclosing strip drawing the faces of the inner tube together and alsodrawing the edges of the filling slit together and cemented to the edgeand opposite side faces of the reinforcing and closing strip tightlyholding the edges of the slit together and sealing the same.

DOUGLAS E. SCOTT.

